Improvement in cut-off valves



J. M. ALBERTSON.

CUT-0F17 VALVE.

010.50320. Patented 001.. 10, 1805.

UNITED STATES PATENT-,Ormea `JAS. M. ALBERTSON, OF NEW LONDON, CONNECTICUT.

IMIPROVEMENT IN CUT-OFF VALVES.

Specification forming part of Letters Patent No. 50,320, dated October 10, 1865; antedated september 27, 1865.

To all whom it may concern:

Be it known that I, J AMns M. ALBEaTsoN, of New London, in the county ot New London, State ot' Connecticut, have invented anew and usefullmprovement in the Valves ot' Steam-En` gines; and I do hereby declare that the following is afull, exact, and clear description thereof, which will enable others skilled in the art io make and use the same, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure l is a vertical section longitudinally through center. Fig. 2 is a vertical section transversely through valve-port.

Similar letters indicate like parts.

Theimprovement consists in placing a. valve. below the valve-seat in the port or passage of a steam-engine cylinder, which conveys steam from the steamchest to the interior ot' the cylinder, the same to be used, in addition to the main-valveof the engine, asa governor or cutoft' valve. In all other engines this is done by avalve in some way above the main valve, so that the steam passes the governor or cut-off valve before passing the main valve or valve that changes the steam at each stroke to opposite sides oi' the piston, so that the steam is arrested or checked in its passage above the main valve.

In my valve under consideration the action ot' the steam in passing the valves is reversed, the steam being arrested or checked after it has Ipassed the main valve and between it and the interior of the cylinder. For the purpose ot' allowing this valve to remain in a closed or partially-closed position for any length of time without in any way interfering with the i'ree passage of exhaust-steam from the cylinder I use an additional port, C C, connecting with the same port which contains the valve under consideration, and also through the main valve with the outlet from the cylinder, which port is used only as an exhaust-port, and is opened and closed by the main valve of the engine, so that. the steam in passing out is never checked or arrested by the position of the valve in thel steam-port, steam being admitted only by the port containing the valve and discharged through the above-described port.

The advanta es claimed b 1m 'arrangement are- Firs the action of the main-valve of the engineis notin any wayinterfered with, it Ybeing entirely separate and distinct in its operation from the valve under consideration, and has no connection with it whatever.

Second, the steam is arrested or checked kin passing into the cylinder nearer the piston,

and consequently much steam is saved in the passages. l

` Third, it is simpler to t up and keep in order than most valves for the s une purpose now in use.

Fourtlntheextreme lightness with which the valve can be constructed and the ease with which it can be moved will dispense with much of' the cumbersome machinery now used in many valves designed for the same purpose.

In the accompanying' drawings, letG represent a steam cylinder with the usual steam and exhaust ports and passages, together with the additional ports, C C, hereinbefore described, communicating respectively with the ports or passages leading to each end ot' the cylinder.y In the ports or passages leading to the interior of the cylinder are placed the valves under consideration. These valves may be either rotary, vibrating, piston, or any form adapted to the purpose, and are introduced into their position under the valve-seat by drilling a hole through the side ot' the steam-chest of the cylinder, which hole is continued to a length not less than the port. The valve is now introduced, a stufng-boxpnt in, and the valve-stem left on the outside ot' the cylinder to be attached to any suitable machinery for working it. The steam then enters through the ports B B only, and exhausts through the ports C C only, the ports C C being auxiliary for the purpose ot' allowing the valve underconsid eration to beleft free of any other duty than that ot' controllingthe engine, or, rather, the admission of steam to 4the engine.

Having thus described my invention, what I claim as myinvention, and wish to secure by Letters Patent, is

1. The placing of a valvebelow the valveseat of a steam-cylinder and in the ports or passages leading to the interior ofthe cylinder, valve herein described, and when used in comvmcombiuation with the auxiliuryexhaust-ports bination with this valve, substantially as set U C, for the purposes substantially as herein forth.

described. i J. M. ALBERTSON.

2. The auxiliary port O C, when used only Witnesses: as au exhaust-port and connected with the E. T. BROWN,

passage into the cylinder which contains the THOMAS DBUMMOND. 

